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METHOD OF ADAPTING THE NOISE MASKING LEVEL IN AN ANALYSIS-BY-SYNTHESIS SPEECH CODER EMPLOYING A SHORT-TERM PERCEPTUAL WEIGHTING FILTER
METHOD OF ADAPTING THE NOISE MASKING LEVEL IN AN ANALYSIS-BY-SYNTHESIS SPEECH CODER EMPLOYING A SHORT-TERM PERCEPTUAL WEIGHTING FILTER
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机译：在采用短期感知加权滤波器的综合语音编码器中调整噪声掩盖水平的方法
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摘要
In an analysis-by-synthesis speech coder employing a short-term perceptual weighting filter with transfer function W(z)=A(z/.gamma.1)/A(z/.gamma.2), the values of the spectral expansion coefficients .gamma.1 and .gamma.2 are adapted dynamically on the basis of spectral parameters obtained during short-term linear prediction analysis. The spectral parameters serving in this adaptation may in particular comprise parameters representative of the overall slope of the spectrum of the speech signal, and parameters representative of the resonant character of the short-term synthesis filter.
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